You will likely need to subclass and modify the JDT editor. Have a look at the JDT source (org.eclipse.jdt.ui.* packages). You can easily work in these with the classic Eclipse SDK as the JDT sources are provided. Use the Plugins view to pull these projects into your workspace so that you can edit them. I don't think there is much documentation on working on the JDT source. Do have a look at the parts of the Eclipse Help related to JDT though.
This is often a problem with temporary files saved by eclipse plugins.Check YOUR_WORKSPACE/.metadata/.plugins/org.eclipse.jdt.core/.There are a lot of index files. Sometimes it helps to delete them.Also, start your eclipse with -clean.
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I've got the same problem though my eclipse is much newer - 4.2 (Juno). For me the solution was to remove /.metadata/.plugins/org.eclipse.core.resources/.snap. Afterwards I found this bug in eclipse.org: Bug 178988 - Crash at startup due to ".snap" files.
Edit: Another Idea ... launch eclipse on an other workspace. Then create a launch configuration for an "Eclipse Configuration" with the workspace that produces an error. Set a java exception breakpoint for NullPointerException. Start in debug mode and you can inspect the variables to see which path produces the problems.
I've installed Eclipse Juno SR1 and switched to my old workspace. When I open a java file in the editor, it seems to be minimized (or hidden). The titlebar shows the current file and the outline displays all methods.
This defines a variable with name it that will resolve to a local variable of type java.util.Iterator. It can be referenced multiple times by simply giving its name without the type: ${it}.
Arguments to a full variable can be written verbatim if they are qualified names or integers. If an argument includes other characters or spaces, then it has to be enclosed in single quotes ''.
According to Lee Nackman, Chief Technology Officer of IBM's Rational division (originating in 2003) at that time, the name "Eclipse" (dating from at least 2001) was not a wordplay on Sun Microsystems, as the product's primary competition at the time of naming was Microsoft Visual Studio, which Eclipse was to eclipse.[21]
It appears to be possible to assign a different editor to an individual file in Eclipse by using the "Open With..." menu. In my case I managed to do this by accidentally pressing the Context menu key and typing I S, which caused my Java file to open w_I_th the default _S_ystem editor. Eclipse then remembered this, so using Ctrl-O to navigate to a method was opening in the external editor despite the .java file remaining open in Eclipse!
I just had this problem too. The solution is to make sure eclipse created the project as Java project. Just create a new Java project and copy your class into the src folder (and import the eventual dependencies). This should fix the problem.
May be the file you have created is outside the src(source) folder. Trying to call the class object(from the file located in the src folder) from the .java file outside the source folder results in the same error. Copy .java file to the source folder, then build it. The error will be gone.
When using the open file dialog on Eclipse, many file types open in the internal editor as expected (.java, .txt). However, others open in an external editor. For example on my system attempting to open .sh file causes it to open it in emacs, and .py files open in bluefish.
The problem with this is that when Eclipse doesn't know what to dowith a given file, it opens it with the so called "System Editor",which actually is... whatever your OS says it is, hence the "rollingdice effect". I don't think you can tell the OS to use Eclipse as thedefault editor (though I didn't try; anyway I wonder why anyone wouldactually want to do it), so you have two alternatives: either installan eclipse plug-in to manage the kind of file you want to edit (likee.g. pyDev for python), or go to Window > Preferences > Editors >File Associations and associate your file extensions to the built-intext editor in Eclipse.
The only real experience I've had programming is in C++, javascript, and Ruby. I've used python here and there as well. In all of these languages, university courses and online tutorials seem to show a linux terminal and a text editor getting the job done.
Originally posted by Lewin Chan:
Well, in order to get the features like telling you have compile problems cos you're using the wrong method in your utility class xyz you will have to allow eclipse to compile java classes. If you just wanted a syntax highlighter, then just a text editor like vim/textpad/ultraedit.
Note: Do refer to configuring eclipse as it is very important which will later help a lot as development reaches a subtle level. take this first step carefully as it eradicates cluttereness which later comes into play.
A good naming convention is to use the same name for the top level package and the project.For example, if you name your project com.example.javaproject you should also use com.example.javaproject as the top-level package name.
The Package Explorer view allows you to display the associated file from the currently selected editor.For example, if you are working on the Foo.java file in the Java editor and switch to the Java editor of the Var.java file, then the corresponding file will be selected in the Package Explorer view.
For example, the following command will install the components EGit, Mylyn and EMF into an Eclipse instance.You need to start this command in the command line and it assumes that you are in a directory which contains your Eclipse installation in a folder called eclipse.
Your Eclipse installation contains a file calledeclipse.iniwhich allows you to configure the memory parameters for theJavavirtualmachine which runs the Eclipse IDE. Forexample,the-Xmxparameter can be used to define how large the Java heap size canget.-Xmsdefines the initial heap size of the Java virtual machine.
The following listing shows an exampleeclipse.inifile. The parameters after -vmargs configure the Java virtualmachine.On a modern machine (with at least 8 Gigabyteavailable memory) assigning 2024 MB or more tothe Javavirtualmachine is a good practice to run Eclipse faster.
Eclipse (@ www.eclipse.org) is a free and open-source Java Integrated Development Environment (IDE), originated from IBM inspired by VisualAge (in 2001), and now maintained by Eclipse Foundation. Eclipse is a desktop app written mostly in Java. However, it uses its own Java graphics library known as SWT (Standard Widget Toolkit), instead of Java's Swing/AWT.
The following program create and write to a text file "out.txt" (via java.util.Formatter), and read it back (via java.util.Scanner). I do the write first so that you can check the location of the exteranl files under eclipse, which is at the project base directory, at the same level as the "src" and "bin".
I tried it, but still think it falls behind most of the good Java IDE's (which I never considered Eclipse to be).
I like vscode for pretty much everything other than java or c/c++, .net, where the best of breed tooling is far far ahead (intellij and visual studio imho).
There is also the benefit of developing in a virtual environment. I'm honestly not sure if eclipse has this functionality, but with the VSCode remote ssh plugin you can remote into your virtual machine (vagrant box or what have you), develop through VSCode on the host machine and keep your dev environment isolated.
(Note that there is another setting named Usage of a raw type that isset to Ignore by default. We recommend leaving this option disabledor set simply to Warn because it is specific to the Eclipse compilerand checks for more stringent requirements than required by the Javalanguage specification. Thus, "Usage of raw type" may complain aboutissues, that while providing insight about your code, is not checked byOracle's javac, which is our official standard for compilationerrors and warnings in this class.)
To create a new Java source file (with the .java extension),select from the top menu File New Class. A window will pop up, asking you details aboutthe class. Leave the source folder as cse331/src, and select a package(e.g. hw1). Choose a name for your class(e.g. MyClass) Type this name in the "Name" field andclick Finish.
You must compile your source code before running it. The javaccompiler is used to transform Java programs into bytecode form, containedin a class file. Class files are recognized by their .classextension. The bytecode in class files can be executed by the javainterpreter.
This will run an Ant script that uses the instructions denoted in build.xml to compile all the .java files into corresponding.class files. Note that if one or more of your files do notcompile, you will receive error messages and no .classfiles will be generated for the files that do not compile properly.
If you would like to manually compile files without the use of an Ant script, you can use javac to compile one or more source files into class files for execution by the Java interpreter.The following commands:
will generate class files hwN/file1.class, hwN/file2.class, etc., for each specifiedsource file. Type "man javac" at the attu prompt for moreinformation on javac options. You should almost always use the-g option, which will provide improved debugging output, and also the -Xlint option, which provides stricter compiler warnings.
Typically, to run a program you will just type ant on the commandline, possibly with a more specific target: ant target.However, you can also invoke the Java virtual machine directly via thejava program.
To run JUnit without using Ant, change to the~/workspace331/cse331/src directory and invoke java org.junit.runner.JUnitCore for the text interfacewith the name of the test class as a parameter. For example, if Iwanted to run RatTermTest, I could type: 2351a5e196
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